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Caution: For OSX 10.9 and newer, the 2.3 driver signed by Apple introduces a bug that requires that MacBS2 be completely closed before disconnecting the programming port, and only reopened after the BASIC Stamp board is reconnected.

If you are using a board with a serial DB9 connector and a USB to Serial Adapter, you can avoid this problem by keeping the COM port open. To do this, leave the USB to Serial Adapter adapter connected to the USB cable, then disconnect and reconnect your BASIC Stamp board at the DB9 connector instead.